Marking ink



Patented May 4, 1948 "OFFICE -MARKING INK Irving 0. Matthews and Glenn M. Atkins, Roches ter, N. Y., assignors to Eastman Kodak Company, Rochester, N. Y.

Jersey No Drawing. Application April 24, 1945, Serial No. 590,122

. 1 Claim. (01. 260-6) Tm l 2 s invention relates to inks, and more par 1 ticularly to inks for marking or lettering on a Pi em; Parts by 553; variety of'surfaces. g 540 As is well known, many difilculties are encountered with the inks now in use for writing or g s preservamve Small 223 lettering on surfaces other than writing paper. One has only to think of the white inks common- W t 240 ly in use for lettering on black paper or on book gi g- 1 0 1 2 0 bindings, or of the difficulty of making satisfacg f tory markings on glass, porcelain, or metals, to 3: an 1 5 g We 1 realize the existence of this problem. Some of Pg; 0 g 545 the difficulties met with in such inks are the folng Prgam fi 1 3 lowing: poor adhesion; low resistance to abrasion; gmen lspersmg agen op evaporation rate of the Vehicle, leaving the The pigme nt may b a hite pigment e g a piginents or fililers it fi atpowderg state and 1161109 titanium-calcium pigment or other titanium pigutsle ess, cziiros \;e e e: ofhiaci t1inks 0 P ment or magnesmm oxide, or it may be a colored 8 fg if g g sg i 3 3 5; pigment or lake ofhany desnled color, or a dye may d. A oft n w a sin ervchanges, dry heat, etc.; poor flowing prop 2:13;: may t: used f i e i z mp le aisill lonil l l if fluowith pens brushes, and in many cases, ride, ammonium salicylate, or borax and ambility to wet the surfaces of many ma i monium hydroxide. White pigment, casein, and g g fi' of E invifition is to provid; an casein preservative may conveniently be intro- LZQhtJkJ 253 2365 555332 11 531; 28R duced in the mm of a cgmmemial s woods, ferrous and non-ferrous metals, electro- 2 3: g gzg gg lig t e water Wm be provlded plated metals' plastics highly polished plate and The resin may be one of the resins described in other glasses, leather, rubber, artificial leather, Patent 2 022 149 prepared from terpinene ggggg ififig g z zg gizggf gg gg gii maleic anhydride, glycerol and a fatty acid. This types'of book bindings painted japagned a0 resin may convenientlybe introduced in the form lacquered surfaces, and textile surfaces. It will if 5 g m g i be noted that many of these surfaces are nonypes 0 res m c may 6 use are p 3 porous formaldehyde resins, and methacrylate resins, emulsion of methyl methacrylate in We have invented an ink which has exception- 8 g ally good adherence to all these surfaces. When g ggi g plastlclzer for the resm may be added iti a liedb m n r't' d i z f g ij 3.3 z fi g g g f 2:2 The most varied types of wetting agent may be it dries in from 2 to 3 mnmteS, and the figures or used, e. g., morpholine, or a sulfonated hydrocarletters can be rubbed in 5 minutes without blur- Or sodium stearate' ring them. In 30 minutes the markings can be Tributyl phosphate is sultable defoammg scraped with the finger nail without removing agent. but other known defoaming agents may be them. The markings resist acids and weak alusedkalies and many solvents. Their water resistance A Suitable anti'oxldant and rust PreVenPive can be increased by heat treatment at sodium tartrate but other known antioxidan 1 Our ink can also be used with very successful reand {11st preventlvs may be usedn as a fill r for the marks in engraved photo- Suitable low-boning solvents include, for exgraphic lens mounts, engraved thermometers, inmpl acetone, denatured alcohol, et y acetate, strument dials, parts of typewriters and adding and m t yl acetate. Suitable medium-boiling solmachines, etched plates, and the like. vents include, for mple, amyl acetate and pine Our novel ink contains the following ingre- 0 oil.

clients, in the approximate proportions indicated:

, a corporation of New In addition to a wetting agent, a pigment-disparsing agent, such as 10-20 parts of a 10-15% gum arable solution, may be added.

The various components of our novel ink may be mixed together in any convenient mill or homogenizer.

As a specific embodiment of our invention, we give the following example or a white ink.

Example Grams Casein paste: (containing approximately 14% casein and 52% titanium-calcium pigment, with water and a small amount of preservative) 30-60 Water 25-35' Terpinene maleic anhydride glycerolfatty acid resin (50-75% solids-m toluuene) 5 -15 Sulionated hydrocarbon we ingagent 2 6 Tributyl phospate 0.3-1.5 Sodium tartrate Oil-0:5 Acetone ii -14' Amy acetate 6-12.

The pH value of this product is approximately 7, so that it does not corrode metals.

the appended claim, all amounts are expressedinparts byweight.

'What-we-claim as our inventionanddesire to be secured-by Letters Patent 01 the United States amyl acetate.

IRVING E3; MATTHEWS. GLENN M. ATKINS.

REFERENCES CITED The following references are of record in the file of this patent:

STATES PATENTS Number .Name Date 20 1,915,148 Berliner June 20, 1933 2,008,018 Hemming July 16, 1935 2,230,230 Boggs Feb. 4, 1941 353,309 White June 13, 1944 OTHER REFERENCES Sutermeister et al., Casein and Its Industrial Applications, Reinhold; 1939, page 3441 Hercules Powder Co.,,Lacquer Emulsions, 1935, pages 3,.4, 11'and12. 

